The method of manufacturing laverov and liner manufactured by the above method

 

(57) Abstract:

The invention relates to technology lanero for long cylindrical articles, such as cylinder housing, plunger pumps, etc., a Thin-walled tube positioned coaxially in a thick-walled shell with a gap. Before installing the pipe strengthen chemical method with both the inner and outer surface to a depth of not less than 0.1 mm, achieving a hardness of at least 800 HV. Then connect the pipe and the shell of the mating surfaces by deformation by cold or warm radial forging. Billet TC and 01 have different mechanical properties. The invention is directed to improving the reliability of products made from lanero in abnormal working conditions by ensuring strict linearity of the inner surface of the liner along the entire length, ensuring durability, rigidity. 2 S. and 4 C.p. f-crystals, 1 Il.

The invention relates to the field of engineering, and in particular to methods of manufacturing lanero for the manufacture of long cylindrical products with higher requirements straightness of the product and wear resistance, in particular Korpusov, producing oil equipment, military equipment.

It is known that for long cylindrical devices that operate in extreme conditions, high demands on operational reliability. So, for example, deep plunger pumps used in oil production, undergo a series of adverse effects, namely work in a hostile environment, in pulse mode, subject to subsidence on the inside walls of the housing sediments asphaltoresinparaffin, etc., result In lower operational reliability of the pump. As the main parts of the pump are the cylinder and the plunger, the improvement of these parts and giving reliability when working in extreme conditions of great significance.

It is now known that the body of the cylinder plunger pump can be made thick-walled, cold-drawn seamless tubes. Due to the great thickness of the walls of the cylinder body is practically not deformed in the process. However, this leads to the reduction of the internal diameter of the pump cylinder, which affects the effective area of the plunger and the pump performance. In addition, the manufacture of thick-walled housing Known also perform body pump cylinder, thin-walled. Such housing is made from seamless pipe or welded pipe longitudinal seam. The internal diameter greater than that of the thick-walled buildings, and this increases the effective area of the plunger. However, due to the small resistance to deformation is necessary to limit the length of the body is thin-walled cylinder. In addition, thin-walled cylinders sensitive to changes of pressure pulsations (see Rismiller, oil sucker rod pumps. Scheller-Bleckmann GMBH, Austria, 1988, S. 30-32).

Known methods of manufacturing lanero for cylinder housing, plunger pumps, allowing to partially address these shortcomings.

A known method of manufacturing lanero, according to which a thin tube is inserted into the shell greater thickness with a gap, then eliminate the gap by plastic deformation of the pipe with simultaneous mechanical hardening (see Orlov, B. C. "design and designing trunks of artillery M., engineering, 1976, S. 38).

The disadvantage of this method is that the connection of thin-walled tube and shell liner by plastic deformation of one of the parts of the liner are excluding meanine backlash-free connection of thin-walled tube with the shell. As a result, the low quality products made from the liner. For example, in the manufacture of these lanero cylinder plunger pumps, in which the shell is made of low carbon steel and thin-walled pipe of high-alloy steel, of the above-mentioned drawback in the process of hardening of the working surfaces of the cylinders of the pumps, for example, the nitriding process occurs at a temperature of 500-600oC, and the tube and jacket are made from a material with different coefficients of volume expansion), one pipe is moved relative to another, and from the resulting gap will be allocated dirt. As a consequence, dramatically increases the time of nitriding, and decreases as hardening of the working surfaces of the pump cylinder, which is unacceptable when the pump extreme well conditions.

The closest to the technical nature of the claimed is a method of manufacturing lanero for long cylindrical articles, which partially resolves the disadvantages of the known similar way. Thus, according to the method described in the patent of Russian Federation N 2095179, CL 21 D 39/04, from 1996, the liner is made as follows:

- made of metals with different mechanical place a thin-walled tube in the shell with a gap,

- then connect them on the mating surfaces by plastic deformation of the workpiece, which is made of a metal with a lower limit of elasticity.

Detail, for example, a thin-walled pipe with a lower limit of elasticity, is subjected to plastic deformation, while another part (shell) having a higher elasticity limit, experiences elastic deformation. After removing the load from the pipe shell adopts its original size and without a gap adjacent to the mating surface of the elastic tube, thereby providing rigidity to the liner.

Although the known method of manufacturing lanero connection between the pipe and shell are considering the mechanical properties of different metals, however, held to impart wear resistance made of such a liner products, such as body pump cylinder, strengthening the working surfaces of the cylinder, for example, by nitriding at a temperature of more than 500oC leads to different deformations of the pipe and casing due to the different coefficients of volume expansion. As a consequence, the curvature of the cylinder barrel along the length, therefore, become unstable diametrical dimensions of the inner surface of the cylinder is remainest working surfaces of the cylinder is a necessary condition of health of a plunger pump, having a greater length of the cylinder (of the order of 4000 mm and more). Even a small deviation Diametric dimensions of the inner channel of the cylinder along its length reduces the operational reliability of the vehicle and the entire pump as a whole.

The famous liner, consisting of made of metals with different mechanical properties of the shell, placed coaxially inside her and narashima connected with her on the mating surfaces of thin-walled tube (see, for example, Orlov, B. C. "design and designing trunks artillery guns. M., engineering, 1976, S. 38).

A disadvantage of known construction is the low reliability made known lanero products, working in extreme conditions, such as plunger pumps in corrosive environments, in the pulsing mode. Carrying out hardening of products such lanero leads to the distortion of such long items due to differences in mechanical properties and makes the product unusable.

The aim of the present invention is to improve the operational reliability of products made from lanero in abnormal working conditions by ensuring strict linearity EXT is in the metal structure and by providing a backlash-free connection of thin-walled tube with the shell while increasing the rigidity of the structure.

An additional goal is to reduce costs for manufacturing Laverov.

This objective is achieved in that in the known method of manufacturing lanero, including coaxial placement of thin-walled tubes in the shell with a gap and subsequent connection of the mating surfaces by deformation, while the thin-walled tube and jacket are made from metals with different mechanical properties, it is new that before placing a thin-walled tubes in the shell produce physico-chemical hardening pipe, and hardening of the lead pipe with the inner and outer surface, the hardening is at a depth of not less than 0.1 mm, achieving a hardness of at least 800 HV, and deformation leads through cold or warm radial forging.

Hardening of thin-walled pipes of lead or nitriding, or anodized, or phosphate, or cementing, etc.

The degree of deformation in radial forging is not less than 8%.

Tube and shell have different coefficients of elasticity limit.

Tube and shell have different coefficients of volume expansion.

Due to the fact that the hardening concoction surface, the opportunity arose:

- to use in the construction of manufactured liner combination of two metals with different mechanical properties (coefficients of volume expansion, modulus);

run a thin-walled tube, the inner surface of which will serve as a working surface in the product metal is more durable and expensive in relation to the shell, which can be made from less durable and inexpensive metal, while providing the necessary rigidity long design;

- exclude high-temperature effects (hardening) connected together by a pipe and a shell made of different metals and thereby completely eliminate the deviation in straightness due to different thermal expansion coefficients of the United parts;

- perform internal working surface of the liner required durability and the desired surface finish;

to ensure the straightness of the liner along the entire length.

The implementation of thin-walled pipes and casing of metals with different mechanical properties allows for the connection of their deformation to provide a backlash-free connection to mating surfaces.

SPS is a W, or cementing, etc., makes the inventive method is universal, while ensuring the required depth of surface hardening and the desired hardness of the working surface.

Due to the fact that the deformation of thin-walled tube and shell produced by cold (at room temperature) or warm (up to 400oC) radial forging on the mandrel, reliable deformation of the pipe, ensuring the highest purity processing work surface and robust gapless bond these two parts.

The degree of deformation of thin-walled pipes should not be less than 8%, or may form cracks in the hardened nitrided layer at a depth of 50-60% of the entire thickness of the layer. The degree of deformation should not exceed 30%, otherwise, may appear Nalepa on the mandrel. As a consequence the danger Sakova, deterioration of the inner surface of the liner below the 8th grade.

This goal is achieved by the fact that in the famous liner, consisting of made of metals with different mechanical properties of the membrane, and are placed coaxially inside her and narashima connected with her on the mating surfaces of thin-walled tube, n is whom hardening of the outer and inner surfaces of thin-walled tubes one protective layer is placed between the mating surfaces of the pipe and casing, and the other on the inner surface of the thin-walled pipe, the thickness of each protective layer is made not less than 0.1 mm, achieving a hardness of at least 800 HV.

This embodiment of the liner with a protective layer made by physico-chemical hardening both external and internal surfaces of thin-walled tubes, making the design of the liner stiffness, straightness along the length, eliminates the gap between the mating surfaces, creates an internal working surface of the liner to the desired wear resistance.

Thus, the proposed method of manufacturing lanero for long cylindrical products ensures the manufacture of such a liner, which has a strong straightness internal working surface along the entire length, stable values of the diameter along the entire length and has a high quality internal cylindrical working surface. All this allows for the production of the claimed liner, with the method of its manufacture, long cylindrical items, high operational reliability anywhere, even in extreme conditions.

The drawing is a schematic representation of a liner for the cylinder downhole plunger pump.

For the manufacture of the liner take the workpiece in the form of a long pipe, mild steel, which is the shell 1 of the liner. Another workpiece is a thin long tube 2 is made of high-alloyed nitriding steels. The shell 1 and the pipe have different mechanical properties: modulus of the pipe 2 is less than the limit of elasticity of the shell 1, as well as different thermal expansion coefficients of.

Thin-walled tube 2 before placing in the shell 1 pre reinforce a chemical method, such as ion nitriding, for which the tube 2 is placed in a special chamber with a temperature of up to 600oC, where a vacuum. Peening of thin-walled tube 2 are both on the outer and on the inner surface with the formation of the protective layers 3 and 4. Nitride protective layers 3 and 4 have a thickness of 0.1 mm, the hardness of the layer 800 HV. Reinforced thin-walled tube 2 is placed inside the shell 1 with a gap, the magnitude of which is determined by the mechanical sveistrup 2 lead deformation method of cold forging (at room temperature) for radial forging machine strikers corresponding GM with deformation rate of 10%, the choice of the diameter of the mandrel radial forging machine defined by the gap between the pipe 2 and the shell 1.

After deformation is obtained reliable backlash-free and high-quality connection of the two parts of the liner, namely: shell thickness of 4.7 mm; tube 1.3 mm; the depth of the protective layer is 0.2 mm; the length of the liner - 4000 mm

Experimental studies made lanero showed that the design of the liner for the cylinder of the pump is performed with a straight inner surface, the inner diameter stable over its entire length, the curvature is minimal. Internal working hardened surface has the desired surface finish 9th grade. The entire length of the inner surface of the liner azotiruemogo protective layer is made integral, the thickness is constant.

Thus, experimental studies have shown that the inventive method of manufacturing Laverov and liner achieve set goals.

The product (building downhole pump), made of the proposed liner meets the requirements of downhole plunger pumps: when the length of the cylinder barrel (of the order of 4000 mm and more) are strictly observed

- his pryamolineinosti the gap between the cylinder and the plunger and avoid sticking of the plunger in the housing during its movement;

- high endurance of the working surface of the product;

- high surface quality of the product;

- reliable operation in harsh environments in pulsed mode;

the reduced cost of the product, because the shell is made of a cheaper metal.

When this method is not complicated to implement.

1. The method of manufacturing lanero, including coaxial placement of thin-walled tubes in the shell with a gap and subsequent connection of the mating surfaces by deformation, while the thin-walled tube and jacket are made from metals with different mechanical properties, characterized in that prior to placing a thin-walled tubes in the shell produce physico-chemical hardening thin-walled pipe, and the hardening of the lead pipe with the inner and outer surface, the hardening is at a depth of not less than 0.1 mm, achieving a hardness of at least 800 HV and deformation leads through cold or warm radial forging.

2. The method according to p. 1, characterized in that the hardening of lead pipe or nitriding, or anodized, or phosphate, or cementing.

3. The method according to p. 1, characterized in that the degree of defblock have different coefficients of elasticity limit.

5. The method according to p. 1, characterized in that the tube and the shell have different coefficients of volume expansion.

6. Leiner, consisting of made of metals with different mechanical properties of the membrane, and are placed coaxially inside her and narashima connected with her on the mating surfaces of thin-walled tube, wherein the liner is further provided with two protective layers made by physico-chemical hardening of the outer and inner surfaces of thin-walled tube, and one protective layer is placed between the mating surfaces of the pipe and casing, and the other on the inner surface of the thin-walled pipe, the thickness of each protective layer is made not less than 0.1 mm, achieving a hardness of at least 800 HV.

 

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